package demo;

public class Computer {
    public void powerOff() {
        System.out.println("关闭电脑");
    }

    public void powerOn() {
        System.out.println("打开电脑");
    }
    public void useDevice(IUSB usb){
        usb.openDevice();
        if(usb instanceof Mouse){
            Mouse mouse = (Mouse) usb;
            mouse.click();
        }
        if(usb instanceof KeyBoard){
            KeyBoard keyBoard = (KeyBoard) usb;
            keyBoard.input();
        }
        usb.closeDevice();

    }

    public static void main(String[] args) {
        Computer computer=new Computer();
        computer.powerOn();
        computer.useDevice(new KeyBoard());
        computer.useDevice(new Mouse());
        computer.powerOff();
    }

}
